The Effect of Wear Ring Clearance on NPSHR

Recommended reading from the 32nd Pump Users Symposium, 2016 A Short Break In recent weeks, we have discussed how an upgrade to composite wear rings allows you to avoid pump seizure, and therefore reduce the wear ring clearance in your pump. This reduction in clearance increases the Lomakin Effect in the pump and improves pump efficiency. One thing we Read the full article…

7 Rules for Using Vespel® CR-6100

We just completed our series on upgrading pumps with DuPont™ Vespel® CR-6100, getting into details on how to upgrade various horizontal and vertical pump types. We discussed reducing the clearance of the wear rings, upgrading throttle bushings with the PERF-Seal design, and upgrading vertically suspended pump shaft bearings. Today, let’s try to condense it all down into Read the full article…

Upgrading Pumps With Composite Wear Components Part: 10

Part 10: Vertically Suspended Pump Installation Tips Review We have discussed how upgrading your pumps with Vespel® CR-6100 helps to eliminate pump seizures, allowing you to reduce wear ring clearance, which improves pump efficiency and improves pump reliability by increasing the Lomakin Effect in the pump. Quality repair and installation practices are an essential counterpart Read the full article…

Upgrading Pumps With Composite Wear Components Part: 9

Part 9: Vertically Suspended Pumps with Separate Discharge (API Type VS4) Review Last week, we looked at vertically suspended pumps with the discharge through the column. This week, we take a look at vertically suspended pumps with a separate discharge (API Type VS4). Vertically suspended pumps with separate discharge are generally used for sump pumps Read the full article…

Upgrading Pumps With Composite Wear Components Part: 8

Part 8: Vertically Suspended Pumps (API Types VS1–3, VS6, VS7) Review To date, we have addressed how to install DuPont™ Vespel® CR-6100 into the various horizontal pump types to eliminate metal-to-metal contact points in the pump and minimize the risk of pump seizure. This allows a reduction of clearance which improves efficiency and rotor stability. This segment will discuss Read the full article…

Upgrading Pumps With Composite Wear Components Part: 7

Part 7: Between Bearings, Radially Split Pumps (API Types BB2, BB4, and BB5) Review DuPont™ Vespel® CR-6100 is a composite material which is used for the stationary wear parts of your pump and can be used in nearly all process chemicals from cryogenic temperatures to 500 F (260 C). The upgrade to Vespel® CR-6100 wear parts Read the full article…

Upgrading Pumps With Composite Wear Components Part: 6

Part 6: Between Bearings, Axially Split Pumps Review DuPont™ Vespel® CR-6100 is a composite material which is used for the stationary wear parts of your pump and can be used in nearly all process chemicals from cryogenic temperatures to 500 F (260 C). Upgrading your pumps with Vespel® CR-6100 wear parts allows you to eliminate the Read the full article…

Upgrading Pumps With Composite Wear Components Part: 5

Part 5: Upgrading overhung pump types with DuPont™ Vespel® CR-6100. Review So far, we have discussed how upgrading your pumps with composite wear parts can help avoid galling and seizing, which allows you to reduce the clearance in your pump. This small change increases the Lomakin Effect and makes your pump more reliable. Reduced clearance Read the full article…

Upgrading Pumps With Composite Wear Components Part: 4

Part 4: Which services, which machines, which parts to upgrade? Review In the first part of this series, we discussed how upgrading your pumps with composite wear parts can help avoid galling and seizing, even when a pump runs dry. Because composite parts do not gall or seize like metal parts, this allows you to reduce the clearance Read the full article…

Upgrading Pumps With Composite Wear Components Part: 3

Part 3: Reduce Clearance–Improve Pump Efficiency Welcome to Part 3 in our series on upgrading pumps with composite wear parts. In the first part of this series, we discussed how upgrading your pumps with composite wear parts can help avoid galling and seizing. Because composite parts do not gall or seize like metal parts, this Read the full article…